Influence of isometric hip extension on contralateral lower trapezius electromyographic activity during scapular retraction
DOI:
https://doi.org/10.47197/retos.v81.119051Keywords:
Force, Electromyography, Lower Trapezium, Lower Limb, Myofascial Force TransmissionAbstract
Introduction: Traditional models describe force transmission as a myotendinous pathway from muscle to bone; however, growing evidence supports myofascial force transmission to adjacent structures, including via the thoracolumbar fascia (TLF). The influence of lower limb activation remains unclear.
Objetive: To investigate the Influence of isometric hip extensor effort on bilateral lower trapezius (LT) electromyographic (EMG) activity during scapular retraction and neutral shoulder position.
Methods: Fifteen healthy male participants were evaluated in four randomised conditions: NPWA (neutral position without lower limb action), NPEA (neutral position with lower limb action), RPWA (scapular retraction without lower limb action), and RPEA (scapular retraction with lower limb action). Surface EMG of left and right LT was recorded and normalised to maximum voluntary isometric contraction, and peak root mean square values were analysed. Repeated measures ANOVA and post-hoc Bonferroni tests were applied.
Results: Left LT activity was significantly lower in RPEA compared to RPWA (Δ=-12.97%, p=0.034). Right LT activity also decreased in RPEA (Δ=-9.40%), though not significantly (p=0.078). No differences were found between NPWA and NPEA. Both retraction conditions (RPWA, RPEA) showed significantly greater LT activation than neutral conditions (p<0.01).
Conclusion: Isometric lower limb effort reduced contralateral LT activation during scapular retraction, suggesting a potential contralateral myofascial modulation via the thoracolumbar fascia.
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